ENTRY 41527 20091126 41484152700000001 SUBENT 41527001 20091126 41484152700100001 BIB 10 24 4152700100002 TITLE Multiplicity spectrometer for measuring neutron cross 4152700100003 sections . 4152700100004 AUTHOR (G.V.Muradyan, Yu.V.Adamchuk, Yu.G.Shchepkin, 4152700100005 M.A.Voskanyan) 4152700100006 INSTITUTE (4RUSKUR) 4152700100007 REFERENCE (J,NSE,90,(1),60,1985) 4152700100008 MONITOR The ratio of capture to fission detection efficiencies4152700100009 1.03 % was used to normalize the alpha value. 4152700100010 Cf-252 measured multiplicity spectrum was used for 4152700100011 absolute alpha normalization. 4152700100012 METHOD (TOF) Multiplicity spectrometry of gamma quanta 4152700100013 and neutrons. 26 m flight path. 4152700100014 FACILITY (LINAC) 4152700100015 DETECTOR (NAICR) 48 sectional detector on the base of Na-I(Tl).4152700100016 Scintillation volume is about 180 litres. 4152700100017 Fission events detection efficiency about 99.8 %, 4152700100018 capture - 96.8 % . 4152700100019 Geometric efficiency about 98 % . 4152700100020 B-10 n-gamma converter (0.27 g/cm**2 thick) was used to4152700100021 detect neutrons by 480-keV gamma quantum of B-10. 4152700100022 Cs-137, Co-60, Cf-252 were used for validation of 4152700100023 detection efficiency . 4152700100024 CORRECTION For backgrounds. 4152700100025 HISTORY (20091126C) Compiled at CJD . 4152700100026 ENDBIB 24 0 4152700100027 NOCOMMON 0 0 4152700100028 ENDSUBENT 27 0 4152700199999 SUBENT 41527002 20091126 41484152700200001 BIB 4 15 4152700200002 REACTION (92-U-235(N,ABS),,ALF,,RES) ALFA at resonance. 4152700200003 SAMPLE Sample consists of six identical 29-mm-diameter, 4152700200004 0.06 g/cm**2 thick disks, placed at 1-cm intervals 4152700200005 along neutron beam axis. 4152700200006 ERR-ANALYS (ERR-T) Total Error, includes: 4152700200007 -statistical error, 4152700200008 -error of determination of form of fission multiplicyt4152700200009 spectra, 4152700200010 -error due to statistical spread of TOF spectra in 4152700200011 resonances, 4152700200012 (ERR-1) error in determining the capture event detectio4152700200013 efficiency, 4152700200014 - error in determining the fission detection 4152700200015 efficiency < 0.1 %. 4152700200016 STATUS (TABLE) Table 1 of J,NSE,90,(1),60,1985) 4152700200017 ENDBIB 15 0 4152700200018 COMMON 1 3 4152700200019 ERR-1 4152700200020 PER-CENT 4152700200021 0.6 4152700200022 ENDCOMMON 3 0 4152700200023 DATA 3 14 4152700200024 EN-RES DATA ERR-T 4152700200025 EV NO-DIM PER-CENT 4152700200026 2.028 3.415 2. 4152700200027 3.610 0.732 2. 4152700200028 4.85 8.262 2. 4152700200029 6.39 3.033 2. 4152700200030 7.08 1.188 2. 4152700200031 8.78 0.397 3. 4152700200032 9.28 0.595 3. 4152700200033 11.66 7.692 2. 4152700200034 12.39 1.466 2. 4152700200035 15.40 0.843 3. 4152700200036 16.08 1.882 2. 4152700200037 19.30 0.681 2. 4152700200038 21.07 1.345 2. 4152700200039 32.07 0.658 2. 4152700200040 ENDDATA 16 0 4152700200041 ENDSUBENT 40 0 4152700299999 ENDENTRY 2 0 4152799999999